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Scrap steel preheating electric furnace flue gas waste heat recovery device

A technology for preheating electric furnace and flue gas waste heat, applied in the field of metallurgy, can solve the problem that dioxins and flue gas waste heat cannot be fully recovered, and achieve the effects of inhibiting dioxin formation, strengthening heat exchange, and avoiding dioxin formation

Inactive Publication Date: 2015-01-07
CISDI ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the deficiency that the waste heat recovery device of flue gas in the prior art will cause the flue gas to generate dioxin and the waste heat of the flue gas cannot be fully recovered, and provides a waste heat recovery device for the waste heat of the scrap steel preheating electric furnace

Method used

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  • Scrap steel preheating electric furnace flue gas waste heat recovery device
  • Scrap steel preheating electric furnace flue gas waste heat recovery device
  • Scrap steel preheating electric furnace flue gas waste heat recovery device

Examples

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Effect test

Embodiment 1

[0042] The electric furnace flue gas waste heat recovery device of this embodiment includes an electric furnace 1, a scrap steel preheating passage 2, a connecting flue 3, a combustion settling chamber 4, a flue 5, a cooler 6, a dust collector 7, a fan 8, a chimney 9, and a cooling The device adopts a partition wall heat exchanger 6, and the connecting flue 3, the combustion and settling chamber 4, and the flue 5 adopt an inner wall insulation structure; The welded pipe 31 and the welded steel pipe 31 are laid with a thermal insulation refractory material layer 32 , and the thermal insulation refractory material layer 32 is provided with anchor nails 33 , and the anchor nails 33 are welded on the steel coil welding 31 . The outer layer of the combustion settling chamber 4 is a concrete structure, the inner wall of the concrete is pre-embedded with anchor nails, and a layer of refractory and heat insulating materials is laid on the inner wall of the concrete. This effectively p...

Embodiment 2

[0045] According to the solution of Embodiment 1, the insulation structure adopted by the shell of the partition heat exchanger 6 is replaced as follows. The thermal insulation structure adopts concrete structure, and anchor nails are pre-embedded in the inner wall of the concrete, and then refractory and thermal insulation materials are laid. Other plans remain unchanged.

Embodiment 3

[0047] According to the solution of Embodiment 1, the insulation structure adopted by the shell of the partition heat exchanger 6 is replaced as follows. Preferably, the shell of the partitioned heat exchanger 6 is formed by splicing cooling pipes. Other plans remain unchanged.

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Abstract

The invention discloses a scrap steel preheating electric furnace flue gas waste heat recovery device. The scrap steel preheating electric furnace flue gas waste heat recovery device comprises a scrap steel preheating channel, a connecting flue, a combustion settling chamber, a flue, a cooler, a dust remover, a fan and a chimney which are connected in sequence, wherein the cooler is a dividing wall type heat exchanger, and the connecting flue, the combustion settling chamber and the flue are of inner wall heat insulated structures. In the scrap steel preheating electric furnace flue gas waste heat recovery device, the connecting flue, the combustion settling chamber and the flue are of the inner wall heat insulated structures, so that the phenomenon that dioxin production is inhibited by slow temperature reduction of smoke from a scrap steel preheating channel outlet is effectively avoided. The cooler is the dividing wall type heat exchanger, can recover smoke waste heat and meanwhile is of splat cooling structure. When internal cooling tubes are three-dimensional outer rib tubes, heat exchange effect between the smoke and a medium in the tubes is remarkably enhanced and the smoke can be rapidly cooled from 800-1000 DEG C to 250 DEG C within 0-2 seconds due to the fact that the outer ribs of the three-dimensional outer rib tubes remarkably decrease the thickness of heat exchange boundary layers of the outer walls of the tubes.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an electric furnace flue gas waste heat recovery device, in particular to a waste steel preheating electric furnace flue gas waste heat recovery device. Background technique [0002] A large amount of high-temperature flue gas is produced during electric furnace smelting, and the heat of high-temperature flue gas is used to preheat scrap steel is the most effective way to utilize waste heat. At present, there are mainly two ways to cool the flue gas after the scrap steel is preheated. The first option is direct cooling by spraying water. Such as figure 1 As shown, in this method, the high-temperature flue gas from the electric furnace 1 passes through the scrap steel preheating channel 2 to preheat the scrap steel, the outlet temperature is 800-1000°C, and directly enters the spray nozzle through the connecting flue 3, the combustion and settling chamber 4, and the flue 5. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00
CPCY02P10/25Y02P80/15
Inventor 董茂林谢建周涛
Owner CISDI ENG CO LTD